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首页> 外文期刊>Canadian Water Resources Journal >Morphodynamics of diversion channels in Northern Manitoba, Canada
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Morphodynamics of diversion channels in Northern Manitoba, Canada

机译：加拿大曼尼托巴省北部引水渠的形态动力学

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摘要

The 2-Mile and 8-Mile diversion channels in Northern Manitoba help to maintain the efficiency of Manitoba Hydro's hydroelectric generating stations located downstream on the lower Nelson River and also assist with flooding control on Lake Winnipeg. Erosion within the channels has been consistently monitored for several decades to better understand these processes to ensure the future performance of the channels. Morphodynamic studies in these channels are complicated due to the high variability of the bed and bank material, the effect of severe cold weather on the erodibility of the channel banks, and the effect of the surrounding lakes on the hydrodynamic conditions of these channels. The present study includes field measurements, experimental testing, and hydrodynamic and thermal numerical modelling to quantify morphological changes within the channels. Moreover, 30 years of monitoring data were analyzed to validate the results of the study. Simple graphs were presented to estimate average applied shear stress over the channel banks and beds based on results of the calibrated and validated hydrodynamic models. Moreover, the effects of wave action on the total applied shear stress were investigated within the 2-Mile Channel under different flow conditions. Comparison between historical cross-sectional survey and results of the numerical models and experiments showed that subaerial processes, mostly freeze-thaw, could be a major eroding factor.
机译：曼尼托巴省北部的2英里和8英里引水渠有助于维持位于纳尔逊河下游的曼尼托巴水电站的水力发电站的效率，还有助于控制温尼伯湖的洪水。数十年来一直对通道内的侵蚀进行了持续监控，以更好地了解这些过程，以确保通道的未来性能。由于河床和河床材料的高度可变性，严酷的寒冷天气对河床堤的易蚀性的影响以及周围湖泊对这些河床的水动力条件的影响，这些河床的形态动力学研究十分复杂。本研究包括现场测量，实验测试以及流体动力学和热力数值模拟，以量化通道内的形态变化。此外，分析了30年的监测数据以验证研究结果。根据已校准和验证的水动力模型的结果，给出了简单的图形来估计河岸和河床的平均施加剪应力。此外，在不同的流动条件下，在2英里通道内研究了波浪作用对总施加剪应力的影响。历史断面调查与数值模型和实验结果的比较表明，航空过程（主要是冻融过程）可能是主要的侵蚀因素。

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